* configure.in: Remove unneeded ALLOC substitution.

* configure: Regenerate.
* aclocal.m4: Ditto.

winsup/cygwin/configure

@@ -586,7 +586,6 @@ ac_no_link=no
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
 CONFIG_DIR
-ALLOCA
 DEF_DLL_ENTRY
 DLL_ENTRY
 LIBSERVER
@@ -4435,7 +4434,6 @@ MALLOC_OFILES=malloc.o
 case "$target_cpu" in
    i?86) DLL_ENTRY="_dll_entry@12"
 		DEF_DLL_ENTRY="dll_entry@12"
-		ALLOCA="_alloca"
 		CONFIG_DIR="i386"  ;;
    *)		as_fn_error $? "Invalid target processor \"$target_cpu\"" "$LINENO" 5 ;;
 esac
@@ -4456,7 +4454,6 @@ configure_args=$(/usr/bin/expr "$configure_args" : 'X \(.*\)')
 
 
 
-
 ac_config_files="$ac_config_files Makefile"
 
 cat >confcache <<\_ACEOF